EP2993019B1 - Procede pour la fabrication d'un pneu - Google Patents

Procede pour la fabrication d'un pneu Download PDF

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Publication number
EP2993019B1
EP2993019B1 EP14791579.7A EP14791579A EP2993019B1 EP 2993019 B1 EP2993019 B1 EP 2993019B1 EP 14791579 A EP14791579 A EP 14791579A EP 2993019 B1 EP2993019 B1 EP 2993019B1
Authority
EP
European Patent Office
Prior art keywords
tire
unvulcanized rubber
rubber member
tread
molding portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP14791579.7A
Other languages
German (de)
English (en)
Other versions
EP2993019A4 (fr
EP2993019A1 (fr
Inventor
Kohei IRIE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP2993019A1 publication Critical patent/EP2993019A1/fr
Publication of EP2993019A4 publication Critical patent/EP2993019A4/fr
Application granted granted Critical
Publication of EP2993019B1 publication Critical patent/EP2993019B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0678—Injection moulding specially adapted for tyres or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/66—Moulding treads on to tyre casings, e.g. non-skid treads with spikes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D2030/0682—Inner liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material

Definitions

  • This disclosure relates to a method for manufacturing an agricultural-machine tire having a tread portion provided with a land portion, and more particularly to a manufacturing method thereof in which a vulcanization molding is performed by using a vulcanizing mold.
  • a manufacturing method in which a vulcanizing mold with its inner peripheral surface formed with concavities and convexities corresponding to blocks and lugs and a green tire formed by attaching a green tread to a green casing are prepared, and the green tire is loaded in the mold for vulcanization, then rubber of the green tread is flowed into the concavities while being pressed by the convexities of the mold has been generally used.
  • a carcass that forms a tire skeleton structure and a belt for reinforcement are disposed on desired positions inside the green casing, they may be locally pressed by the convexities of the mold or moved with the rubber flowing into the convexities, which may cause the belt, or the like, to be shifted from its original position and distortion may occur.
  • tires mounted on agricultural vehicles used in the paddy field or the soft ground, or the like, or mounted on construction vehicles driving on the rough ground have high lugs rising from the outer surface of a tire body to obtain a high traction, which allows a lot of green tread rubber to be flowed into the concavities of the mold.
  • distortion of the carcass and the belt becomes pronounced and the tire performance may be affected.
  • JP2012-045917A illustrates a method in which a plurality of vulcanized lug members corresponding to lugs are previously loaded in a vulcanizing mold, then a green casing, which serves as a tire body, is loaded in the vulcanizing mold, and after that the lug members are vulcanized with a green casing to bond with one another.
  • the present invention provides method for manufacturing an agricultural-machine tire in which a vulcanizing mold is used for vulcanization molding to manufacture a tire including a tread portion provided with a land portion, the vulcanizing mold comprising: a tire molding portion in which a casing member constituting a tire body is disposed, and which is configured to define an outer surface shape of the tire; an extrusion preparing portion in which an unvulcanized rubber member for forming a tread portion can be disposed; and a rubber inflow path communicating between the tire molding portion and the extrusion preparing portion, wherein the vulcanization molding includes: loading the casing member in the tire molding portion and loading the unvulcanized rubber member in the extrusion preparing portion; subsequently, extruding the unvulcanized rubber member to a tread molding portion through the rubber inflow path, the tread molding portion being formed in the tire molding portion and configured to define an outer surface shape of the land portion; and subsequently, vulcanizing the extruded unvulcanized rubber member and the casing
  • the land portion is formed into a required shape when the unvulcanized rubber member is extruded into the tread molding portion, thus it is not necessary to form the unvulcanized rubber member into a shape corresponding to the land portion.
  • This allows for easy alignment of the unvulcanized rubber member when it is loaded in the mold.
  • a work for fitting or refitting a plurality of lug members into each mold, as in the past, is no more needed, which allows for reduction in time required for manufacture and improvement of work efficiency.
  • the temperature of the unvulcanized rubber member to be extruded rises due to friction against the surrounding members that is caused when the member flows or shear heating of the rubber itself or the like, thus less time is required for vulcanization.
  • the rubber injection molding machine When the unvulcanized rubber member is extruded into the mold, a rubber injection molding machine is usually used. However, in this manufacturing method, the rubber member can be extruded by the pressing member provided in the vulcanizing mold, thus the cost required for the tire manufacturing facility can be reduced.
  • yet another tire manufacturing method of this disclosure is configured such that, in the above-described principal tire manufacturing method, a rigid core comprising a plurality of core segments is provided inside the vulcanizing mold, the plurality of core segments being disposed movably outward and inward in the tire radial direction, wherein the unvulcanized rubber member is extruded after moving the core segments outward in the tire radial direction to expand a diameter of the casing member.
  • the casing member When the unvulcanized rubber member flows at a high pressure, the casing member may be depressed inward in the tire radial direction and deformed. However, with this manufacturing method, the casing member is supported by the rigid core from inward in the tire radial direction, thus deformation of the casing member can be reliably suppressed.
  • This disclosure provides, when a tire having a tread portion provided with a land portion is manufactured, a tire manufacturing method in which distortion of a carcass and a belt caused by vulcanization can be suppressed, and work efficiency can be improved while reducing the time required for manufacture as well.
  • the tire 1 is generally formed of a tread portion 2 provided with a plurality of lugs 2a as a land portion and an annular tire body 3, which is the tire 1 without the tread portion 2.
  • the tire 1 is formed by preparing a casing member 4 illustrated in FIG. 3 , which serves as a tire body 3, and an unvulcanized rubber member 5 forming the tread portion 2 separately, and loading them in a vulcanizing mold 20 for vulcanization to bond with one another.
  • the casing member 4 has a structure in accordance with the tradition and includes, for example, a carcass toroidally extending between a pair of bead cores to form skeleton of the tire and a belt located on the outer peripheral side of a crown region of the carcass.
  • the outer peripheral surface of the casing member 4 is not basically provided with a tread rubber, it may be provided with a thin tread rubber as needed.
  • unvulcanized rubber member that is not vulcanized depending on the type of the tire, semi-vulcanized rubber member that is partially vulcanized before being loaded into the vulcanizing mold 20 or completely vulcanized rubber member may be used as the casing member 4.
  • the unvulcanized rubber member 5 is formed of tread rubber, and various rubbers are chosen depending on the desired function of the tire. Further, the unvulcanized rubber member 5 according to this embodiment is prepared by cutting the rubber member, which is extruded by the extruder 10 into a predetermined cross-sectional shape as illustrated in FIG. 2 , into a predetermined length by a cutting machine 11, which is schematically illustrated in the figure.
  • the vulcanizing mold 20 includes a tire molding portion 21 that has the casing member 4 disposed therein and defines the outer surface shape of the tire 1, an extrusion preparing portion 22 in which the unvulcanized rubber member 5 formed into a predetermined shape can be disposed, and a rubber inflow path 23 communicating between the tire molding portion 21 and the extrusion preparing portion 22.
  • the vulcanizing mold 20 is divided into two, an upper portion and a lower portion, and consists of a lower mold 20a and an upper mold 20b.
  • a lower tire molding portion 21a and an upper tire molding portion 21b provided by dividing the tire molding portion 21 into two are formed inside of the lower mold 20a and the upper mold 20b, respectively.
  • the extrusion preparing portion 22 is provided outward of the lower tire molding portion 21a in the tire radial direction.
  • the extrusion preparing portion 22 is not needed to be formed into a shape corresponding to the lug 2a, and it may be formed into a simple shape such as a rectangular cross-sectional shape as illustrated, for example, which allows alignment to be performed easier when the unvulcanized rubber member 5 is attached to the extrusion preparing portion 22.
  • a simple shape such as a rectangular cross-sectional shape as illustrated, for example, which allows alignment to be performed easier when the unvulcanized rubber member 5 is attached to the extrusion preparing portion 22.
  • common unvulcanized rubber member 5 can be used if they have the same shape, thus work efficiency can be improved.
  • the rubber inflow path 23 connects the extrusion preparing portion 22 and the portion corresponding to the lug 2a of the tire molding portion 21 (tread molding portion), and as illustrated, it is provided so that it connects to the portions corresponding to respective lugs 2a of the lower tire molding portion 21a (lower tread molding portion 21c), then other than that, provided so that, when the vulcanizing mold 20 is closed, it connects to the portions corresponding to respective lugs 2a of the upper tire molding portion 21b (upper thread molding portion 21d) as well, which is not illustrated.
  • the upper mold 20b is provided with, on a position thereof corresponding to the extrusion preparing portion 22 provided in the lower mold 20a, a pressing member 24 disposed movably toward the extrusion preparing portion 22.
  • the unvulcanized rubber member 5 loaded in the extrusion preparing portion 22 is allowed to be flown into the lower tread molding portion 21c and the upper tread molding portion 21d through the rubber inflow path 23.
  • the extrusion preparing portion 22 and the pressing member 24 are provided in the vulcanizing mold 20, thus a rubber injection molding machine that is usually used when extruding an unvulcanized rubber member into a mold is no more needed.
  • the vulcanizing mold 20 is provided with, on a portion thereof located inward of the casing member 4 in the tire radial direction, a diameter expansion means that expands the diameter of the casing member 4 toward the sidewall of the tire molding portion 21.
  • the lower mold 20a is provided with a bladder 25 that swells outward in the tire radial direction.
  • a diameter expansion means various kinds of means such as a structure by which a high pressure gas is blown to the inside of the casing member 4 to directly swell the casing member 4, a rigid core having a plurality of core segments disposed movably inward/outward in the tire radial direction or the like, which is not illustrated, can be applied.
  • the casing member 4 and the unvulcanized rubber member 5 formed into a predetermined shape by the extruder 10 and the cutting machine 11, for example, are prepared.
  • the unvulcanized rubber member 5 is loaded in the extrusion preparing portion 22 provided in the lower mold 20a and the casing member 4 is loaded in the lower tire molding portion 21a.
  • the upper mold 20b is moved relative to the lower mold 20a to close the vulcanizing mold 20, and a bladder 25 is operated to expand the diameter of the casing member 4 toward the sidewall of the tire molding portion 21.
  • the pressing member 24 is operated to be moved toward the unvulcanized rubber member 5, thereby allowing the unvulcanized rubber member 5 in the extrusion preparing portion 22 to flow into the lower tread molding portion 21c and the upper tread molding portion 21d through the rubber inflow path 23.
  • the pressure at the time when the unvulcanized rubber member 5 flows is larger than the pressure for swelling the bladder 25, the casing member 4 with an expanded diameter may be depressed inward in the tire radial direction. In this case, the depression of the casing member 4 can be prevented by using the rigid core as a diameter expansion means. After that, the casing member 4 and the unvulcanized rubber member 5 can be bonded with one another through vulcanization under required conditions (temperature, time, pressure).
  • the lug 2a is formed of the unvulcanized rubber member 5, thus flowing of rubber of the casing member 4 into the lower tread molding portion 21c and the upper tread molding portion 21d is suppressed, and thus distortion of the carcass and the belt can be suppressed.
  • the extrusion preparing portion 22 is provided in the lower mold 20a, thus it is unlikely that the unvulcanized rubber member 5 loaded in the extrusion preparing portion 22 falls out of it, and refitting work of a plurality of lug members that was likely to occur in the past is no more needed, which will further improve work efficiency.
  • the force required for moving the pressing members 24 all at once would be increased, which would increase the size of the facility and even decline the productivity. Accordingly, a plurality of pressing members 24 are provided in the tire circumferential direction, and only a part thereof are moved toward the unvulcanized rubber member 5, then the rest of the members are moved in order, thereby avoiding increase in the size of the facility.
  • the tire performance can be improved by adopting rubbers made from materials different from each other to the rubber for the outermost periphery of the casing member 4 and to the rubber for the unvulcanized rubber member 5 forming the tread portion 2.
  • a foamed rubber may be used as a rubber for the outermost periphery of the casing member 4, which allows water in the mud to be absorbed by the foamed portion when a vehicle drives in a moist place like mud, and thus attachment of mud to the tire 1 can be effectively decreased
  • the rubber with high hardness hardness of 60° to 90° according to the durometer hardness test (A type) of JISK6253
  • a type durometer hardness test
  • the rubber with high hardness which is the same as that of the above-mentioned unvulcanized rubber member 5 may be adopted to the outermost periphery of the casing member 4. In this case, generation of cracks on the bottom of the groove of the tread portion 2 can be suppressed.
  • the disclosed manufacturing method By the disclosed manufacturing method, distortion of a carcass and a belt in a tire caused by vulcanization for manufacturing tires can be suppressed, and new tires can be stably supplied while reducing the time required for manufacture and improving the work efficiency as well.
  • the disclosed manufacturing method may be used not only for tires for agricultural machines explained in this embodiment, but may preferably be used for manufacture of various tires such as tires for vehicles, tires for track/bus, off the road tires, tires for two wheels, or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Claims (2)

  1. Procédé de fabrication d'un bandage pneumatique pour une machine agricole, utilisant un moule de vulcanisation (20) pour le moulage par vulcanisation, pour fabriquer un bandage pneumatique incluant une partie de bande de roulement comportant une partie d'appui ;
    le moule de vulcanisation (20) comprenant :
    une partie de moulage du bandage pneumatique (21), dans lequel est disposé un élément de carcasse (4) constituant un corps du bandage pneumatique, et configuré pour définir une forme de la surface externe du bandage pneumatique ;
    une partie de préparation de l'extrusion (22), dans laquelle peut être disposé un élément de caoutchouc non vulcanisé (5) pour former une partie de bande de roulement ; et
    une trajectoire d'entrée du caoutchouc (23) établissant une communication entre la partie de moulage du bandage pneumatique (21) et la partie de préparation de l'extrusion (22) ;
    dans lequel le moulage par vulcanisation inclut les étapes ci-dessous :
    chargement de l'élément de carcasse (4) dans la partie de moulage du bandage pneumatique (21 et chargement de l'élément de caoutchouc non vulcanisé (5) dans la partie de préparation de l'extrusion (22) ;
    ensuite, extrusion de l'élément de caoutchouc non vulcanisé (5) sur une partie de moulage de la bande de roulement (21c, 21d) à travers la trajectoire d'entrée du caoutchouc (23), la partie de moulage de la bande de roulement (21c, 21d) étant formée dans la partie de moulage du bandage pneumatique (21) et étant configurée pour définir une forme de la surface externe de la partie d'appui ; et
    ensuite, vulcanisation de l'élément de caoutchouc non vulcanisé extrudé (5) avec l'élément de carcasse (4) ;
    dans lequel le moule de vulcanisation (20) comprend en outre plusieurs éléments de pressage '(24) dans la direction circonférentielle du bandage pneumatique, chacun des éléments de pressage (24) étant disposé de manière à pouvoir être déplacé vers la partie de préparation de l'extrusion (22) ; et
    dans lequel les éléments de pressage (24) sont chacun déplacés par rapport à l'élément de caoutchouc non vulcanisé (5) dans la partie de préparation de l'extrusion (22), pour extruder l'élément de caoutchouc non vulcanisé (5) ;
    caractérisé en ce que :
    seule une partie des éléments de pressage (24) est déplacée vers l'élément de caoutchouc non vulcanisé (5), la partie restante des éléments de pressage (24) étant ensuite déplacée, dans l'ordre.
  2. Procédé selon la revendication 1,
    dans lequel un noyau rigide comprenant plusieurs segments de noyau est agencé à l'intérieur du moule de vulcanisation (20), les plusieurs segments de noyau étant disposés de manière à pouvoir se déplacer vers l'extérieur et vers l'intérieur dans la direction radiale du bandage pneumatique ; et
    dans lequel l'élément de caoutchouc non vulcanisé (5) est extrudé après le déplacement des segments de noyau vers l'extérieur dans la direction radiale du bandage pneumatique, pour étendre un diamètre de l'élément de carcasse (4).
EP14791579.7A 2013-05-01 2014-04-25 Procede pour la fabrication d'un pneu Not-in-force EP2993019B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013096356A JP6122686B2 (ja) 2013-05-01 2013-05-01 農業機械用のタイヤの製造方法
PCT/JP2014/002337 WO2014178181A1 (fr) 2013-05-01 2014-04-25 Procede pour la fabrication d'un pneu

Publications (3)

Publication Number Publication Date
EP2993019A1 EP2993019A1 (fr) 2016-03-09
EP2993019A4 EP2993019A4 (fr) 2016-04-20
EP2993019B1 true EP2993019B1 (fr) 2017-08-16

Family

ID=51843326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14791579.7A Not-in-force EP2993019B1 (fr) 2013-05-01 2014-04-25 Procede pour la fabrication d'un pneu

Country Status (4)

Country Link
US (1) US9975304B2 (fr)
EP (1) EP2993019B1 (fr)
JP (1) JP6122686B2 (fr)
WO (1) WO2014178181A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113263871A (zh) * 2021-06-18 2021-08-17 吉利汽车研究院（宁波）有限公司 轮胎及其制备方法、以及汽车

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US2724425A (en) * 1953-06-30 1955-11-22 Us Rubber Co Tire building method
NL6512032A (fr) * 1965-09-15 1967-03-16
DE2103096C3 (de) * 1971-01-23 1980-01-17 Fried. Krupp Gmbh, 4300 Essen Kern für eine Gießform zum Herstellen von Fahrzeugluftreifen
IT1056803B (it) * 1976-03-02 1982-02-20 Pirelli Procedimento per la fabbricazione di battistrada di penumatici per autoveicoli
US4715577A (en) * 1985-07-31 1987-12-29 The Goodyear Tire & Rubber Company Apparatus for injection molding tire treads
US4795329A (en) * 1987-04-13 1989-01-03 The Goodyear Tire & Rubber Company Apparatus for injection molding tire treads
JPH02227243A (ja) * 1989-02-28 1990-09-10 Sumitomo Rubber Ind Ltd タイヤトレッドの射出成型装置
JP2672065B2 (ja) * 1993-03-25 1997-11-05 住友ゴム工業株式会社 空気入りタイヤの製造方法
JPH0732814A (ja) * 1993-07-14 1995-02-03 Sumitomo Rubber Ind Ltd ソリッドタイヤの製造方法
DE19846365C2 (de) * 1998-10-08 2000-11-30 Continental Ag Verfahren und Vorrichtung zum Komplettieren einer vulkanisierten Reifenkarkasse zu einem fertigen Reifen
JP2006321080A (ja) * 2005-05-18 2006-11-30 Bridgestone Corp 空気入りタイヤの製造方法および装置
JP2011031452A (ja) * 2009-07-31 2011-02-17 Bridgestone Corp 更生タイヤ製造方法、更生タイヤ製造用モールド及び加硫装置
JP5530342B2 (ja) 2010-07-28 2014-06-25 株式会社ブリヂストン ラグ付きタイヤの製造方法及びタイヤ

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
EP2993019A4 (fr) 2016-04-20
EP2993019A1 (fr) 2016-03-09
WO2014178181A1 (fr) 2014-11-06
JP6122686B2 (ja) 2017-04-26
US9975304B2 (en) 2018-05-22
JP2014217956A (ja) 2014-11-20
US20160059501A1 (en) 2016-03-03

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